Linear Tolerances

Basic linear tolerance E1 call outs represent tolerances on one side of the parting line only. For dimensions that cross the parting line add E2 to E1. For dimensions including features in both the mold itself and in core add E3 to E1 and/or E2. The amount of additional tolerance for E2 and E3 is determined by the projected area of either the casting at the parting line for E2 or the projected area of the core in contact with the casting for E3.

For dimensions which cross the parting line, are defined in part by core or are in some other way additive, these tolerances may require some expansion. The foundry should be consulted and good judgment is recommended.

Consult your foundry for specific information.

Basic Linear Tolerance	(E1)
	Sand	Permanent Mold
			Machined Tooling	Cast & Polished Mold
Up thru 6 in.	+- 0.030	Up through 1 in.	+- 0.015	+- 0.030
Additional each inch over 6	+- 0.002	Additional each inch over 1	+- 0.002	+- 0.003

Additional Tolerance for Cores or Across Parting Lines (E2 & E3)
Projected Horizontal	Sand Casting	Permanent Mold	Permanent Mold	Permanent Mold
Area of Casting or Core	Parting Line & Core	Parting Line	Sand Core	Metal Core
Up to 10 square inches	+- 0.020	+- 0.010	+- 0.015	+- 0.010
10 - 50 sq in	+- 0.035	+- 0.015	+- 0.025	+- 0.015
50 - 100 sq in	+- 0.045	+- 0.020	+- 0.030	+- 0.015
100 - 250 sq in	+- 0.060	+- 0.025	+- 0.040	+- 0.022
250 - 500 sq in	+- 0.090	+- 0.030	+- 0.050	+- 0.032

St. Paul Foundry

954 Minnehaha Avenue West
Saint Paul, Minnesota 55104

(651) 488-5567 Fax: (651) 488-0908
Sales & Estimating: (651) 312-4734 email

Directions

Use Good Design Principles

1. St. Paul Foundry is providing this information on metal characteristics for informational purposes only. Before making a final decision on alloy selection consider the following and all other appropriate design and specification principles. Please note that this is not an exhaustive list.

2. Consult the appropriate specification from an accredited specifying body (ASTM, SAE, Federal or Military) to determine current minimum values of this alloy.

3. Use appropriate design safety factors.

4. Use Failure Modes and Effects Analysis to help identify possible weaknesses in designs and specifications.

5. Use computerized stress analysis tools.

6. Use appropriate certification requirements for your casting suppliers. These may include test bars, chemical certifications, radiography, dye penetrant or other non-destructive testing methods.

7. Test your design to failure in a controlled environment. Then test it to failure in a simulation of its end use.

8. You and you alone are responsible for the suitability of your design and the materials that you select.

Disclaimer

WHILE EVERY EFFORT IS MADE BY ST. PAUL FOUNDRY (SPF) TO ENSURE ACCURACY, THIS INFORMATION IS PROVIDED FOR GENERAL INFORMATION PURPOSES ONLY AND NOT FOR ANY OTHER PURPOSE. BY ACCESSING THIS INFORMATION, YOU AGREE THAT IT MAY BE REVISED AT ANY TIME, IT IS PROVIDED “AS IS” AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, THAT NO WARRANTY OR REPRESENTATION IS MADE ABOUT ITS CONTENT OR SUITABILITY FOR ANY PURPOSE, AND THAT SPF EXPRESSLY DISCLAIMS WARRANTIES OF MERCHANTABILITY AND FITNESS. YOU ASSUME ALL RISK AND LIABILITY FOR ANY LOSS, DAMAGE, CLAIM, OR EXPENSE RESULTING FROM YOUR REVIEW, USE, OR POSSESSION OF THIS INFORMATION.

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